单项选择题

To keep a conversation flowing smoothly, it is better for the participants ______.

A．not to wear dark spectacles
B．not to make any interruptions
C．not to glance away from each other
D．not to make unpredictable pauses
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单项选择题
Babies will not be stimulated to smile by a person ______.
A．whose front view is fully perceived
B．whose face is covered with a mask
C．whose face is seen from the side
D．whose face is free of any covering
单项选择题
The author is convinced that the eyes are ______.
A．of extreme importance in expressing feelings and exchanging ideas
B．something through which one can see a person's inner world
C．of considerable significance in making conversations interesting
D．something the value of which is largely a matter of long debate
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